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Fair Value of Financial Assets and Liabilities - Summary of Changes in Values of Derivative Liability (Detail)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]  
Derivative Liability, Fair value, Beginning Balance $ 25
Derivative Liability, Change in fair value (22)
Derivative Liability, Fair value, Ending Balance $ 3